help please

A pharmaceutical oompany developed a new drug to help reduce LDL {bad} cholesterol. In clinical trials, the company randomly divided 300 patients with high LDL levels into three groups. The subjects in group 1 received a placebo. The subjects in group 2 received a competing drug. The subjects in group 3 received the new experimental drug. Alter six months. researchers determined whether the subject's LDL cholesterol decreased. (a) What type of study is this? 0 A. Crosssectional observational study 0 B. Completely randomized design 0 C. Cohort observational studyr O D. Casecontrol observational study 0 E. Matched-pairs design (b) What type of inferential procedure would you recommend to the researcher? O A. Chi-Square Test of Independence O B. Hypothesis Test for a Single Mean 0 c. Good nessptFit Test O D. Hypothesis Test for Two Dependent Means O E. Hypothesis Test for a Single Proportion O F. Hypothesis Test for Two Independent Means O G. Hypothesis Test for Two Independent Means O H. Homogeneity of Proportions